公开(公告)号：US3725701A

公开(公告)日：1973-04-03

申请号：US3725701D

申请日：1971-10-26

Applicant: ANDROS INC

Inventor： LINK W

IPC: G01N21/37 ,  G01N21/64 ,  H01J37/00

CPC classification number: G01N21/3504 ,  G01N21/37 ,  G01N21/61

Abstract: A non-dispersive infrared gas analyzer utilizing a fluorescent source including a specific gaseous compound whose presence in an unknown gas mixture is to be detected and a container having infrared transparent portions. Fluorescent emission from the specific gaseous compound is stimulated by, for example, a black body infrared source. A sample cell retains an unknown gas mixture in a position to receive fluorescent emission so stimulated while a suitable detector or transducer detects energy absorption by the unknown gas mixture of substantially any portion of the fluorescent emission spectrum of the gaseous compound being detected. An additional stage of selectivity is obtained by inserting a fluorescent filter between the sample cell and the detector. A standard for comparison is provided by a two-channel gas analyzer utilizing a standard cell or normalizing cell in addition to the sample cell. A standard for comparison is also provided by including in the fluorescent source a gaseous compound and enriched quantities of one or more isotopes of the gaseous compound to provide different but nearby wave lengths. A variety of arrangements for signal chopping and for shielding the black body infrared source from the sample cell is included.

Abstract translation: 使用包含特定气体化合物的荧光源的非分散红外线气体分析仪，其中存在未知气体混合物并且具有红外线透明部分的容器。 来自特定气体化合物的荧光发射由例如黑体红外光源刺激。 样品池将未知气体混合物保持在接收如此被刺激的荧光发射的位置，同时合适的检测器或换能器检测到被检测的气态化合物的荧光发射光谱的基本上任何部分的未知气体混合物的能量吸收。 通过在样品池和检测器之间插入荧光过滤器可获得额外的选择性阶段。 用于比较的标准由除了样品池之外的标准单元或标准化单元的双通道气体分析仪提供。 还通过在荧光源中包含气态化合物和浓缩量的气态化合物的一种或多种同位素以提供不同但附近的波长来提供比较标准。 包括用于信号斩波和用于屏蔽来自样品池的黑体红外源的各种布置。